SOLUTION ; 



(a) From Example Problem 3, the maximum breaker heights for a design depth 

 of 2.5 m (8.2 ft), a slope of 0.05, and wave periods of 6- and 10-seconds 

 are 



H^, = 2.8 m (9.2 ft) (T = 6 s) 



R^ = 3.2 m (10.5 ft) (T = 10 s) 



The wavelength at the wall in water 2.5 m (8.2 ft) deep can be found with 

 the aid of Table C-1, Appendix C. First calculate the wavelength in deep 

 water (T = 6 s ), 



2 

 L = -^ = 1.56 (6)^ = 56.2 m (184 ft) 



^TT 



Then 



d 2.5 



L 56.2 

 



= 0.04448 



and from Table C-1, Appendix C, 



f = 0.08826 

 and 



L^ = 28.3 m (92.8 ft) 



from equation (7-88) 



D = d + L , m = 2.5 + 28.3 (0.05) = 3.9 m (12.8 ft) 



s a 



and using Table C-1, as above. 



hence 



say 



|- = 0.06940; f- = 0.1134 



D 3.9 ^, , 



L = 35 m (115 ft) 



7-183 



